Count of 0 s in an N | C # implementation of the approach ; Function to return the count of 0 s in an n - level hexagon ; Driver code
using System ; class GFG { static int count ( int n ) { return 3 * n * ( n - 1 ) + 1 ; } static public void Main ( ) { int n = 3 ; Console . Write ( count ( n ) ) ; } }